2015-10-30 00:53
sipa changed the topic of #bitcoin-wizards to: This channel is for discussing theoretical ideas with regard to cryptocurrencies, not about short-term Bitcoin development |
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<
stevenroose >
Two questions about Bulletproofs: (1) Are they unconditionally sound like the prior CTs? (2) Is there still a way to recover part of the commitment size for memos?
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<
nsh >
it's compression so there's no chance for unconditional soundness. there's a design choice between perfect blinding and perfect hiding.
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<
nsh >
and there's no means to recover a message from the proof due to the compression
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<
nsh >
unless you introduce more entropy i suppose but that would defeat the point of efficient aggregation
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<
nsh >
the soundness is computational and based on the one-more discrete logarithm problem's assumed difficulty
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<
waxwing >
nsh, you said 'blinding' when you meant 'binding', i do that all the time too, it's really irritating that near-identical words have such conflicting meanings :)
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<
nsh >
sorry, my bad!
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<
nsh >
good catch :)
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nsh >
it's that hiding is used for the effect of a kind of blinding and that's a wee bit confusing, but mainly it's because i'm unrigorous and silly :)
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<
waxwing >
yeah in that specific context, you unfortunately end up saying the opposite of what you mean from 1 extra l
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<
andytoshi >
stevenroose: nobody has every deployed unconditionally sound rangeproofs AFAIK. bulletproofs are not unconditionally sound
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<
andytoshi >
and yes, you can recover the blinding factor and value without much trouble at all, i've implemented this
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<
andytoshi >
you can recover another 64 bytes for memos if you go through a lot of trouble
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<
andytoshi >
and when you aggregate proofs the memo size doesn't increase so it's of limited value..
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